pluto_hdl_adi/library/axi_sysid/axi_sysid.v

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`timescale 1ns / 1ps
module sys_id #(
parameter ROM_WIDTH = 32,
parameter ROM_ADDR_BITS = 9)(
//axi interface
input s_axi_aclk,
input s_axi_aresetn,
input s_axi_awvalid,
input [15:0] s_axi_awaddr,
input [2:0] s_axi_awprot,
output s_axi_awready,
input s_axi_wvalid,
input [31:0] s_axi_wdata,
input [3:0] s_axi_wstrb,
output s_axi_wready,
output s_axi_bvalid,
output [1:0] s_axi_bresp,
input s_axi_bready,
input s_axi_arvalid,
input [15:0] s_axi_araddr,
input [2:0] s_axi_arprot,
output s_axi_arready,
output s_axi_rvalid,
output [1:0] s_axi_rresp,
output [31:0] s_axi_rdata,
input s_axi_rready,
input [ROM_WIDTH-1:0] sys_rom_data,
input [ROM_WIDTH-1:0] pr_rom_data,
output [ROM_ADDR_BITS-1:0] rom_addr);
localparam AXI_ADDRESS_WIDTH = 12;
localparam [31:0] CORE_VERSION = {16'h0001, /* MAJOR */
8'h00, /* MINOR */
8'h00}; /* PATCH */
localparam [31:0] CORE_MAGIC = 32'h53594944; // SYID
reg up_wack = 'd0;
reg [31:0] up_rdata_s = 'd0;
reg up_rack_s = 'd0;
reg up_rreq_s_d = 'd0;
reg [31:0] up_scratch = 'd0;
wire up_clk;
wire up_rstn;
wire up_rreq_s;
wire [(ROM_ADDR_BITS+1):0] up_raddr_s;
wire up_wreq_s;
wire [(ROM_ADDR_BITS+1):0] up_waddr_s;
wire [31:0] up_wdata_s;
wire [31:0] rom_data_s;
assign up_clk = s_axi_aclk;
assign up_rstn = s_axi_aresetn;
assign rom_addr = up_raddr_s [ROM_ADDR_BITS-1:0];
assign rom_data_s = (up_raddr_s [ROM_ADDR_BITS + 1'h1: ROM_ADDR_BITS] == 2'h1) ? sys_rom_data :
(up_raddr_s [ROM_ADDR_BITS + 1'h1: ROM_ADDR_BITS] == 2'h2) ? pr_rom_data : 'h0;
up_axi #(
.AXI_ADDRESS_WIDTH(ROM_ADDR_BITS+4))
i_up_axi (
.up_rstn (up_rstn),
.up_clk (up_clk),
.up_axi_awvalid (s_axi_awvalid),
.up_axi_awaddr (s_axi_awaddr[ROM_ADDR_BITS+3:0]),
.up_axi_awready (s_axi_awready),
.up_axi_wvalid (s_axi_wvalid),
.up_axi_wdata (s_axi_wdata),
.up_axi_wstrb (s_axi_wstrb),
.up_axi_wready (s_axi_wready),
.up_axi_bvalid (s_axi_bvalid),
.up_axi_bresp (s_axi_bresp),
.up_axi_bready (s_axi_bready),
.up_axi_arvalid (s_axi_arvalid),
.up_axi_araddr (s_axi_araddr[ROM_ADDR_BITS+3:0]),
.up_axi_arready (s_axi_arready),
.up_axi_rvalid (s_axi_rvalid),
.up_axi_rresp (s_axi_rresp),
.up_axi_rdata (s_axi_rdata),
.up_axi_rready (s_axi_rready),
.up_wreq (up_wreq_s),
.up_waddr (up_waddr_s),
.up_wdata (up_wdata_s),
.up_wack (up_wack),
.up_rreq (up_rreq_s),
.up_raddr (up_raddr_s),
.up_rdata (up_rdata_s),
.up_rack (up_rack_s));
//delaying data read with 1 tck to compensate for the ROM latency
always @(posedge up_clk) begin
up_rreq_s_d <= up_rreq_s;
end
//axi registers read
always @(posedge up_clk) begin
if (up_rstn == 1'b0) begin
up_rack_s <= 'd0;
up_rdata_s <= 'd0;
end else begin
up_rack_s <= up_rreq_s_d;
if (up_rreq_s_d == 1'b1) begin
case (up_raddr_s)
8'h00: up_rdata_s <= CORE_VERSION;
8'h01: up_rdata_s <= 0;
8'h02: up_rdata_s <= up_scratch;
8'h03: up_rdata_s <= CORE_MAGIC;
8'h10: up_rdata_s <= ROM_ADDR_BITS;
default: begin
up_rdata_s <= rom_data_s;
end
endcase
end else begin
up_rdata_s <= 32'd0;
end
end
end
//axi registers write
always @(posedge up_clk) begin
if (up_rstn == 1'b0) begin
up_wack <= 'd0;
up_scratch <= 'd0;
end else begin
up_wack <= up_wreq_s;
if ((up_wreq_s == 1'b1) && (up_waddr_s == 8'h02)) begin
up_scratch <= up_wdata_s;
end
end
end
endmodule